Locking mechanism



Nov. 22, 1927.

J. A. MUZZIO LOCKING MECHANISM Fil'ed May '25, 1925 avg maniac VII 2 r a R Patented Nov. 22, 1927.

warren STA-TIES PATENT OFFICE.

s. MUZZIO, or CLEVELAND,

LOCKING MECHANISM.

Application filed May 25,

This invention relates to locking mechanism and more particularly to cylinder locks. upon the construction described and claimed in my prior application for locking mechanism, filed January 2, 1928, Serial No.

Said prior application illustrates cylinder locking mechanism in which the rotatable plug and stationary barrel or cylinder are concentrically related and provided with a special roll-back mechanism, the parts of which may be withdrawn or retractedwithin the outer cylindrical boundary of the barrel to enable the barrel to be inserted into lock mechanism and wherein rotation of the plug throws the roll-back or dog outwardly beyond the boundary of the cylinder for actuation of the dead bolt or other device. In such prior locking mechanism,however, the rollback is so arranged as to be capable of turning or swinging movement through only approximately three hundred degrees, or something less than a complete revolution. As a consequence a cylinder lock of that kind upon one side ofa door becomes inoperative or ineffective as soon as the dead bolt is thrown in one direction or the other by similar locking mechanism or a latch or so handle-operated device on the other side of the door, due to the inability of the rollback to either pass the dead bolt and reach the swinging latch or to pass around the back or far are of travel and reach the swinging latch from the other side.

The object of the present invention is to provide improved roll-back mechanism for a cylinder lock of the kind described capable of being swung or turned through acomplete arc of three hundred and sixty degrees so that a lock on one side of the door is unaffected by manipulation of the dead bolt fronrthe other side of the door.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

In the drawings Fig. 1 represents a face view of locking mechanism embodying the invention as applied to-a door, the casing cover being omitted for simplicity of illustration; Fig. 2 is a similar view showing the dead bolt partly moved to locking position; Fig. 3 is a detail section on the line 3-3;

2; and Fig. 4 is a detail sectional elevation on the line l4, Fig. 3.

The invention is an improvement cylinder.

1923. Serial No. 641,391.

Referring to the drawings, 1 representsa portion of the casing of an ordinary door lock'in which are mountedthe usual dead bolt 2 and a pivoted-spring latch or tumbler 3, tongue &' of which projects through a recess in the deadbolt for engagement by the roll-back or dog, as usual. 5 represents generally the cylinder lock, comprising a cylinder or barrel 6 and a plug 7 rotatable therein and provided with an opening to receive the key 8. Cylinder and plug mem here 6 and 7 are concentric or co-a'xially related, as shown, and otherwise may be of any suitable form. Theyare provided with the usual key-controlled tumblers and slots arranged m any suitable manner so that the plug may be rotated in the cylinder 6 by insertion and manipulation of the key. For

example, the tumblers and interconnecting parts of the plug and cylinder may be of the form illustrated in my prior applications for cylinder lock, one filed January 13, 1922, Serial No. 528,952, and the other filed of even date herewith, to which reference may be had fora more complete description if necessary The drawings illustrate the parts as of the form in my filed of even date herewith.

Asis usual the cylinder is inserted into an opening in the lock casing with its longitudinal axis transverse to the direction of movement of the dead bolt and is so held by a locking screw 9. The roll-back or dog is indicated at 10. It comprises an arm pivoted at 11 on a pin carried by a circular supporting plate or wall 12 lying in a plane normal to the axis of the plug and attached to the cylinder by a connecting bridge 13, being otherwise free of connection to the The pivot pin 11 is eccentric to the axis of the plug and cylinder. Said arm 10 has a slot 14 extending lengthwise thereof and also in a direction intersecting the pin 11. Into said slot extends a crank pin integral with or attached to a portion such as a flange, of the rotatable plug 7 This pin is so located on the plug as to be radially more distant from its axis than is the pin 11 so that the latter pin 11 lies within the circle of rotation of pin 15. The operation is as follows:

Fig. 3 two cylinder and plug locks in axial alignment with each other. For thepurposes of this application it may be assumed that the prior application illustrates the door-providedwith v 10 shown in Fig. 1 cannot be moved in the counterclockwise direction but can only be caused to become effective upon the latch and dead bolt by being turned in the clock wise direction to swing past and inside of the bridge 13. In this manner each of the two locking and roll-back devices shown is wholly independent of the other. Obviously the mechanism on the inside of the door for throwing the bolt need not be a cylinder plug and roll-back as illustrated, but might be an ordinary latch or knob-controlled lever or device as is customary.

Other advantages of the invention will be obvious to those skilled in the art.

What I claim is:

1. Cylinder lock mechanism, comprising relatively rotatable cylinder and plug members, a supporting portion spaced therefrom and lying in a plane substantially normal to the axis of said plug, a roll-back pivoted on said supporting portion, and a crank member rigidly carried by said plug for actuating said roll-back.

centrically related cylinder and plug mem-' bers, a supporting portion spaced therefrom and lying in a plane substantially normal to the axis of said plug, a roll-back pivoted on said supporting portion on anaxis eccentric to the cylinder axis, and a crank pin rigidly carried by said plug for actuating said roll-back and located outwardly from the cylinder axis beyond the center of rota"- tion of said rollback. 7

4. Cylinder lock mechanism, comprising concentrically related cylinder and plug members, a support beyond the end thereof, a roll-back pivoted on said support on an axis eccentric to the cylinder axis, and a crank pin rigidly carried by the plug for actuating said roll-back and located outwardly from the cylinder axis beyond the center of rotation of said roll-back, said roll-back having an elongated slot within whichsaid crankpin is longitudinally movable.

In testimony whereof I hereby aflix my signature.

JAMES A. MUZZIO. 

